1 /****************************************************************************/ 2 3 /* 4 * uclinux.c -- generic memory mapped MTD driver for uclinux 5 * 6 * (C) Copyright 2002, Greg Ungerer (gerg@snapgear.com) 7 * 8 * $Id: uclinux.c,v 1.12 2005/11/07 11:14:29 gleixner Exp $ 9 */ 10 11 /****************************************************************************/ 12 13 #include <linux/module.h> 14 #include <linux/types.h> 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/fs.h> 18 #include <linux/major.h> 19 #include <linux/mtd/mtd.h> 20 #include <linux/mtd/map.h> 21 #include <linux/mtd/partitions.h> 22 #include <asm/io.h> 23 24 /****************************************************************************/ 25 26 struct map_info uclinux_ram_map = { 27 .name = "RAM", 28 }; 29 30 struct mtd_info *uclinux_ram_mtdinfo; 31 32 /****************************************************************************/ 33 34 struct mtd_partition uclinux_romfs[] = { 35 { .name = "ROMfs" } 36 }; 37 38 #define NUM_PARTITIONS ARRAY_SIZE(uclinux_romfs) 39 40 /****************************************************************************/ 41 42 int uclinux_point(struct mtd_info *mtd, loff_t from, size_t len, 43 size_t *retlen, u_char **mtdbuf) 44 { 45 struct map_info *map = mtd->priv; 46 *mtdbuf = (u_char *) (map->virt + ((int) from)); 47 *retlen = len; 48 return(0); 49 } 50 51 /****************************************************************************/ 52 53 int __init uclinux_mtd_init(void) 54 { 55 struct mtd_info *mtd; 56 struct map_info *mapp; 57 extern char _ebss; 58 unsigned long addr = (unsigned long) &_ebss; 59 60 mapp = &uclinux_ram_map; 61 mapp->phys = addr; 62 mapp->size = PAGE_ALIGN(ntohl(*((unsigned long *)(addr + 8)))); 63 mapp->bankwidth = 4; 64 65 printk("uclinux[mtd]: RAM probe address=0x%x size=0x%x\n", 66 (int) mapp->phys, (int) mapp->size); 67 68 mapp->virt = ioremap_nocache(mapp->phys, mapp->size); 69 70 if (mapp->virt == 0) { 71 printk("uclinux[mtd]: ioremap_nocache() failed\n"); 72 return(-EIO); 73 } 74 75 simple_map_init(mapp); 76 77 mtd = do_map_probe("map_ram", mapp); 78 if (!mtd) { 79 printk("uclinux[mtd]: failed to find a mapping?\n"); 80 iounmap(mapp->virt); 81 return(-ENXIO); 82 } 83 84 mtd->owner = THIS_MODULE; 85 mtd->point = uclinux_point; 86 mtd->priv = mapp; 87 88 uclinux_ram_mtdinfo = mtd; 89 add_mtd_partitions(mtd, uclinux_romfs, NUM_PARTITIONS); 90 91 return(0); 92 } 93 94 /****************************************************************************/ 95 96 void __exit uclinux_mtd_cleanup(void) 97 { 98 if (uclinux_ram_mtdinfo) { 99 del_mtd_partitions(uclinux_ram_mtdinfo); 100 map_destroy(uclinux_ram_mtdinfo); 101 uclinux_ram_mtdinfo = NULL; 102 } 103 if (uclinux_ram_map.virt) { 104 iounmap((void *) uclinux_ram_map.virt); 105 uclinux_ram_map.virt = 0; 106 } 107 } 108 109 /****************************************************************************/ 110 111 module_init(uclinux_mtd_init); 112 module_exit(uclinux_mtd_cleanup); 113 114 MODULE_LICENSE("GPL"); 115 MODULE_AUTHOR("Greg Ungerer <gerg@snapgear.com>"); 116 MODULE_DESCRIPTION("Generic RAM based MTD for uClinux"); 117 118 /****************************************************************************/ 119